Allow groc to run independently in parallel builds.
Allow groc to run independently in parallel builds.

With these changes, groc will run for any source file change,
but is no longer dependent on maven or other targets that
tests depend on.

My expectation is that groc will generally be able to run
in parallel before unit tests complete without slowing down
a typical edit/test cycle.

RedSeal-co/ts-tinkerpop,RedSeal-co/ts-tinkerpop,RedSeal-co/ts-tinkerpop,RedSeal-co/ts-tinkerpop